tolong bantu ya dengan cara

3) <AOB = 180-72 = 108°

Luas juring AOB = 108/72 x45 = 108/8 x 5 = 67,5 cm^2

4) Panjang busur BC = 150/40 x 32 = 150/5 x 4 = 600/5 = 120 cm^2

5) a. CD =√OC^2 - √OD^2 = 25 - 9. = 16 cm
b. Luas juring AOC = 1/3 x 3,14 x 25 x 25 = 654,16667 → 654,2 cm^2
c. Luas segitiga AOC = 32 x 9 / 2 = 144 cm^2
d. Luas tembereng ACB = 654,2 cm^2 -144 cm^2 = 510,2 cm^2